Listening stats: time listened per day, streak and finished audiobooks

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

librivox.js

@@ -2,7 +2,7 @@
 // address (the recordings are hosted by the Internet Archive), keeps each person's shelf of saved books and where they got to in each one.
 const fs = require('fs'), path = require('path');
 const users = require('./users'), genres = require('./genres');
-const prog = require('./progress')('librivox-progress.json'); // keyed lv:<book id>: seconds into the whole book
+const prog = require('./progress')('librivox-progress.json', 'audiobook'); // keyed lv:<book id>: seconds into the whole book
 
 const BASE = () => (process.env.LIBRIVOX_URL || 'https://librivox.org').replace(/\/+$/, '');
 const HOSTS = () => ['librivox.org', 'archive.org', new URL(BASE()).hostname];